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If you’re in need of a lightweight Merino top that’s packed with natural warmth and performance, but prefer a more relaxed and casual fit than our contact fit base layers (hey, we get it, base layers aren’t perfect for everyone, especially those of us who aren’t rocking six packs!) then look no further as this one ticks all the boxes.

Made from our flagship MicroMerino® fabric with 96% superfine Australian Merino Wool and 4% Elastane for an easy four-way stretch, not only does this top offer high performance, it also feels incredibly soft and comfortable. Plus, the flat lock seams, raglan sleeves and heat transferred tags help eliminate any uncomfortable chafe.

With temperature regulation and odor-resistance, you can wear the Zone on its own when you’re traveling or adventuring in cool to mild conditions, or pair it up with extra layers such as the Altitude Tank or Vital Crew when the weather hits hard.

The combination of merino wool and 4% elastin in the 'Enigma' fabric ensure perfect body contact, eliminates excessive bulk, and a 4-way stretch allowing your limbs to move freely as the fabric does not inhibit your range of motion.

Antimicrobial - Moisture absorption properties reduce the tendencies for a build-up of odour.

Luxuriously soft next to skin

Breathable and temperature regulating

Ultra-comfortable warmth

Maximum warmth, minimal weight

Quick drying

All ioMerino fabrics are fully machine-washable.

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Aesthetic, odour resistent and comfy

Review by Damo on 1/22/18

Looks great. Super comfortable. I honestly called bs when I originally got told it would be odour resistant, but I have worn it for weeks without washing and it doesn't smell. Only ever need to wash it when it is visibly dirty. Have since bought it in a different colour

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THE best casual IO Merino piece

Review by Kyle on 10/18/16

One of the best bits of clothing IO Merino has produced. A great stylish cut and colours, perfect 'casual fit' that's not too tight or too loose, and the micromerino fabric will breathe to keep you warm or cool as the conditions require. 9/10 - you won't be disappointed with this piece!